Soft-db Opus Suite SLM 4-Ch Module Manual de usuario descargar pdf (Pagina 23)

6.5 Reference Value

The reference value is the unit reference from which the decibel (dB) is calculated.

6.6 FFT High Pass Filter

The FFT spectrum frequency bandwidth can be adjusted from a variety of choices:

Bandwidth

FFT Lines

Frequency Resolution

20 kHz

854

23.4 Hz

10 kHz

854

11.7 Hz

5 kHz

854

5.85 Hz

3.33 kHz

854

3.90 Hz

2 kHz

854

2.34 Hz

1 kHz

854

1.17 Hz

An electronic high-pass filter set at 0.9 Hz is applied on the input to block any DC. However, another

filter can be applied to the FFT Spectrum to match the 1/3 octave spectrum frequency span, which is

6.3 Hz to 20 kHz if 1 or 2 inputs are enabled an 20 Hz to 20 kHz if 3 or 4 inputs are enabled.

The high pass filter cut-off frequency can be lowered but the global level resulting from the sum of

the FFT lines may be different than the SLM global levels (LS, LF, LI, Leq and SEL) and their associated

1/3 Octave Spectrum.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 69 70

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Soft-db Opus Suite SLM 4-Ch Module Manual de usuario Pagina 23